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A jewel bearing is a plain bearing in which a metal spindle turns in a jewel-lined pivot hole. The hole is typically shaped like a torus and is slightly larger than the shaft diameter. The jewels are typically made from the mineral corundum , usually either synthetic sapphire or synthetic ruby .
Jewel bearing of a balance wheel, supported by a lyre-shaped spring. The Incabloc shock protection system is the trade name for a spring-loaded mounting system for the jewel bearings that support the balance wheel in a mechanical watch, to protect the wheel's delicate pivots from damage in the event of physical shock, such as if the watch is dropped.
In watches and some high quality clocks their arbors have jewel bearings. The going train in a modern clock or watch consists of: First or great wheel attached and ratcheted to the main spring, or cable, barrel. The ratchet allows the main spring or cable barrel to be wound without turning the wheel.
The cup-shaped depression in the top of the jewel is the oil cup; it's purpose is to hold the lubricating oil (yellow) in contact with the bearing shaft by capillary action. In wheels where friction is critical, a 'capstone' (shown in Watch jewel bearing and capstone.svg ) is added on the end to prevent the shoulder of the shaft from bearing ...
The jewels (red) are made of synthetic ruby. The lower jewel is called the 'hole jewel', the upper one is the 'capstone' or 'end jewel'. This type of bearing is used in watches where friction is critical, such as in the balance wheel pivots. With ordinary bearings (shown in Watch jewel bearing.svg), when the watch is vertical the shoulder of ...
Smartwatches are a hot-ticket gift over the holidays, but a new study might have you rethink how you strap the device to your wrist in the future. The study, which was just published in the ...
In the three axis tourbillon movement, the 3rd (external) cage has a unique form which provides the possibility of using jewel bearings everywhere, instead of ball-bearings. This is a unique solution at this size and level of complication. [11] There are a few wrist and pocket watches that include the Triple Axis or Tri-Axial Tourbillon ...
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